Mechanical stoker



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Application mcd anuarr 6, i921. serial No. 435,484.

To all whom z't may Gomera: Y

Be it known that l, fr, :mf ltofrr Woon, a citizen of the United Statesof America, residing in London, England, have invented certain new anduseful Improve ments in Mechanical Stokers, of which the following isaspecifcation.

l ,An endless travelling y grate Stoker is structed under the upper runwith the object of supplying air at a pressure graduated from front torear of the grate. The riddlings -from the upper run of the grate fallto the bottoms of the boxes and have to be removed therefrom, while thesaid` bottoms prevent radiation from the'upper run to the surface of thewater. l

The essential feature of the resent invention consists in a water trougbeneathl the endless grate the surface of the water inwhich is freelyexposed to radiation from the upper run of the 'rf whilemore or less ofthe length of "l iowerrun travels.

beneath the surface of the water.

Several advantages accrue from this feature of the invention.

It frequently hap ens that for one reason or another the endluess grateis -brought to rest while combustion remains vigorous on the upper run.ln these circumstances there has hitherto been a tendency for the metalof the upper run of the ate to become overheated and damaged. isprevented by the invention, since the steam developed by the radiationreceived at the surface ot the water comes in contact withthe metal othe upper run and cools it.

y providing a plate to act as a curtain extending from the under surfaceet the 11p-l.l

per run to below the surface of the water in the front part of thetrough, there is formed a chamber beneath the grate which. may receiveair when the pressure beneath the upper run is to exceed that of theatmosphere and ma be edectually sealed by the said plete.. r, thecurtain being adapted to be raised to any desired hei ht above thesurface of the water, or being' provided with an adjustable opening, theadmission of air to the chamber may be controiied when the draught lisby suction through the ,grate instead of by pressure. Thus an ectual borconstruction beneath vthe grate is avoided, and there is the 'advantagethat the bottom of the chamber is water, so that riddlings are not onlyimmediately quenched, but are G@ automatically removed more or lesscornpletely by falling on to the lower run which carries them forward tobe scraped od at the' front of the grate, while that portion Yv-whichfalls through the grate to the bottom @f5 f of the trough may be removedby hand or otherwise. ln the closed box construction previously used theriddlings were apt to burn in the box, overheating the several parts ofthe construction and leading toloss 7@ .of matter still available asfuel.

-The foregoing advantage is even more marked when the system ofgraduatedV draught is adopted, slnce the collection of riddlings in theseveral compartments-into i5 which the box construction was subdividedWes even more troublesome than in an undivided box. By this inventionthe separate compartments are formed by successive curtains extending'from the underside of the 8@ upper run to the water surface and suitablyadjustable or having 'suitably adjustable openlngs.

There is yet another very considerable advantage, namely that the troughmay be constructed of concrete or masonry and serve as the compressionmember of the whole construction. Hitherto much of the cost of theconstruction has resided in the iron compression members introduced in9@ 'compensation for the tension exerted by the upper run has beendescribed in the s eciiication to my ap lication for United tetes m5Letters Patent rial No.' 435,483 of even date herewith and forms no partot this invention. At the rear end of the upper run is a ate platform orstage g from which the c inkel' and ashes are discharged. The u@ lowerrun traveis in the water contained in the trough d of concrete, thesides of which walls.

carry plates e forming the sides of the chamber beneath the upper run ofthe grate. The latter is supported on rollers, f journalled in the upperparts of plates e.

ll`he roller b is carried in bearing blocks mounted on the sides oftrough d, one such block being shown at b. The block is mounted to slidein a plate b2 and is adjusted in position by a screw spindle b3.. Theend of the plate b2 is flanged as at b* to enage the end of the side ofthe trough d. loller 0 is similarly mounted in bearing blocks carried bvplates such as c but rigid therewith, these plates also having endflanges c2 serving to anchor them to the side It will' be seen that thetensional strain of the endless grate is transmitted through the rollersb and c and their anchoring plates to the walls of the trough d, whichis -therefore a compression member of vthe structure.

In the case illustrated the chamber beneath the upper run of the grateis subdivided into three compartments for graduated air supply. Thefront wall of the chamber is a' plate in two parts o, 02, both carriedon a bar 01 journalled in the plates e and capable of being turned by ahandle outside 'the chamber to .lift the lower edge of titi part o fromthe water in the trough; the upper part o2 of the late is stationary andrests against one 0f t e rollers f. Plates p an'd g mounted similarly too form the partitions between the compartments, each extends to within ashort distance of the surface ofthe water, thus leaving a passage forair from one compartment to the next, which ma be increased by turningthe bar on .which the plate is mounted.

The air is in this case delivered by fan r to the rst compartmentthrough ort s.

Riddlings that fall through t e water on to the lower run 'of theendless grate may be removed by a scraper placed at a point near thefront drum b so that the riddlings are removed into a suitablereceptacle outside the trough before the grate passes round the drum.

Having thus described the nature of the said 'invention and the bestmeans l know of carrying the same into practical ellect, l claim l. Anendless traveling grate stolrer comprising an upper run, a stage at therear of the. upper run from which the clinher and ashes are discharged,a lower run and a water trough the surface of the water in which isfreely exposed to radiation from ths'said upper run while a portion ofthe said lower run travels beneath the surface of the water.

2. An endless travelling grate stoler coinprising an upper run, a stageat the rear ofthe upper run from which the clinlrer and ashes aredischarged, a lower run and a con crete water trough the surface of thewater 7. An endless travelling grate Stoker in which is freely exposedto radiation from the said upper run while a portion of the said lowerrun travels beneath the surface of the water, end rollers over which thegrate travels, and bearings for the said rollers anchored to the ends ofthe said trough.

3. ,An endless travelling grate stoker com prising an upper run, a stageat the rear of' the upper run from whichthe clinker and ashes aredischarged, a lower run, a water trough the surface of the water inwhich is freely 'exposed to'A radiationv from the said upper run, whilea portion of the said lower run travels beneath the surface ofthe water,and side walls enclosingr the space between the said upper run and thewater surface so as to form an air chamber.

4. An endless travelling grate Stoker comprising an upper run and alower run, combined with a water trough the'surfaceof the water in whichis freely exposed to radiation from the saidI upper run to beneath thewater surface. ,Y

5. An endless travelling grate Stoker comprising an upper run, a stageatthe rear of the upper run from which the clinker and Y ashes aredischarged, a water troughl beneath the upper run, open-bottomedchambersbeneath the said upper run, and means for supplying air to thesaid chambers.

6. An endless travelling grate Stoker having an upper run and a owerrun, 'a water trough beneath the surface of the water in which the saidlower run travels, side walls enclosing the space between the said upperrun and the water surface, a4 front wall to the said space extendingfrom the said upper run to beneath the said surface, transversepartitions in the said enclosed space and means for adjusting thedistance between the lower edges of these partitions and the watersurface.

having an upper run'and a lower run, a front roller anda rear rollerover which rollers the travelling grate runs, a concrete or masonrytrough beneath the grate, supports for the said rollers anchored to theends of the' freely exposed to radiation from the said upper run while aportionof the said'lower run envels beneath the surface of the lnstimony whereof l' have signed naine; 'this specihcation.

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